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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29542] Issue related MongoDB upgraded Version 3.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-29542</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have upgraded MongoDB version to 3.4 for my application. I am facing performance degradation issue. After upgrading MongoB version from 2.9 to 3.4, CPU usage for the application is increasing automatically. Why am I facing this issue? Why performance degrade after upgrading the MongoDB version? Is there any specific thing on which I have to concern?&lt;/p&gt;</description>
                <environment>windows</environment>
        <key id="389474">SERVER-29542</key>
            <summary>Issue related MongoDB upgraded Version 3.4</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="Ravi44">Ravi Gangwar [X]</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Jun 2017 06:45:03 +0000</created>
                <updated>Mon, 21 Aug 2017 06:23:57 +0000</updated>
                            <resolved>Fri, 9 Jun 2017 19:03:51 +0000</resolved>
                                    <version>3.4.4</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1652539" author="ravi44" created="Mon, 21 Aug 2017 06:23:57 +0000"  >&lt;p&gt;Thanks.&lt;/p&gt;</comment>
                            <comment id="1593325" author="thomas.schubert" created="Fri, 9 Jun 2017 19:03:51 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Ravi44&quot; class=&quot;user-hover&quot; rel=&quot;Ravi44&quot;&gt;Ravi44&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="1585694" author="david.hows" created="Fri, 2 Jun 2017 07:13:56 +0000"  >&lt;p&gt;Hi Ravi,&lt;/p&gt;

&lt;p&gt;What you have described sounds like the issue captured in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3158&quot; title=&quot;Fix structure layout on Windows.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3158&quot;&gt;&lt;del&gt;WT-3158&lt;/del&gt;&lt;/a&gt;. If this is the case, then downgrading temporarily to 3.4.3 should recover the missing performance, as &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3158&quot; title=&quot;Fix structure layout on Windows.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3158&quot;&gt;&lt;del&gt;WT-3158&lt;/del&gt;&lt;/a&gt; impacts only 3.4.4.&lt;/p&gt;

&lt;p&gt;The fixes in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3158&quot; title=&quot;Fix structure layout on Windows.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3158&quot;&gt;&lt;del&gt;WT-3158&lt;/del&gt;&lt;/a&gt; should be included in the next point release of MongoDB 3.4&lt;/p&gt;

&lt;p&gt;If this does not recover the performance then I would need significantly more detail from you in order to understand the nature of the regression. If the regression is still present when running 3.4.3 then please detail in full your server configuration, mongodb configuration and the nature of your workload. Additionally please upload the diagnostic.data file from both 3.4.4 and 3.2 with details and timing of when the regression was present and how you measured it.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
David&lt;/p&gt;</comment>
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